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參數(shù)資料
| 型號： | MAX4356 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 16x16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers |
| 中文描述： | 16 x 16、無阻塞視頻交叉點開關，帶有屏幕顯示插入及輸入/輸出緩沖器 |
| 文件頁數(shù)： | 35/41頁 |
| 文件大?。?/td> | 853K |
| 代理商： | MAX4356 |
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M
16 x 16 Nonbloc king Video Crosspoint S witc h
with On-S c reen Display Insertion and I/O Buffers
______________________________________________________________________________________
35
stream equal to n x 96 bits, where n is the number of
MAX4356 devices on the bus. The first 96-bit data word
programs the last MAX4356 in line (see
Matrix
Programming under Applications Information).
On-S c reen-Display Fast Mux
The MAX4356 features an asynchronous dedicated 2:1
Mux for each output buffer amplifier. Fast 40ns switch-
ing times enable pixel switching for on-screen-display
(OSD) information such as text or other picture-in-pic-
ture signals (Figure 1). OSDFILL_ inputs are buffered
analog inputs connected to each dedicated OSD Mux.
Switching between the programmed IN_ input from the
crosspoint switch matrix and the OSDFILL_ is accom-
plished by driving the dedicated OSDKEY_ digital
input. A logic low on OSDKEY
i
routes the analog signal
at OSDFILL
i
to the OUT
i
output buffer. OSDKEY_ con-
trol does not affect the crosspoint switch matrix pro-
gramming or the output buffer enable/disable or
gain-set programming.
RESET
The MAX4356 features an asynchronous bidirectional
RESET
with an internal 20k
pullup resistor to V
DD
.
When
RESET
is pulled low, either by internal circuitry,
or driven externally, the analog output buffers are
latched into a high-impedance state. After
RESET
is
released, the output buffers remain disabled. The out-
puts may be enabled by sending a new 96-bit data
word or a 16-bit individual output address word. A reset
is initiated from any of three sources.
RESET
can be
driven low by external circuitry to initiate a reset, or
RESET
can be pulled low by internal circuitry during
power-up (power-on reset) or thermal shutdown.
Since driving
RESET
low only clears the output buffer
enable bit in the matrix control latches,
RESET
can be
used to disable all outputs simultaneously. If no new
data has been loaded into the 96-bit complete matrix
mode register, a single
UPDATE
restores the previous
matrix control settings.
Power-On-Reset
The power-on reset ensures all output buffers are in a
disabled state when power is initially applied. A V
DD
voltage comparator generates the power-on-reset.
When the voltage at V
DD
is less than 2.5V, the power-
on-reset comparator pulls
RESET
low through internal
circuitry. As the digital supply voltage ramps up cross-
ing 2.5V, the MAX4356 holds
RESET
low for 40ns (typ).
Connecting a small capacitor from
RESET
to DGND
extends the power-on-reset delay. See Power-on Reset
vs.
RESET
Capacitance in the
Typical Operating
Characteristics.
T hermal S hutdown
The MAX4356 features thermal shutdown protection
with temperature hysteresis. When the die temperature
exceeds +150
°
C, the MAX4356 pulls
RESET
low, dis-
abling the output buffers. When the die cools by 20
°
C,
the
RESET
pulldown is deasserted, and output buffers
remain disabled until the device is programmed again.
Applic ations Information
Building Large V ideo S witc hing S ystems
The MAX4356 can be easily used to create larger
switching matrices. The number of ICs required to
implement the matrix is a function of the number of
input channels, the number of outputs required, and
whether the array needs to be nonblocking or not. The
most straightforward technique for implementing non-
blocking matrices is to arrange the building blocks in a
grid. The inputs connect to each vertical bank of
devices in parallel with the other banks. The outputs of
each building block in a vertical column connect
together in a wired-OR configuration. Figure 6 shows a
128-input, 32-output, nonblocking array using the
MAX4356 16 x 16 crosspoint devices.
The wired-OR connection of the outputs shown in the
diagram is possible because the outputs of the IC
devices can be placed in a disabled or high-imped-
ance output state. This disable state of the output
buffers is designed for a maximum impedance vs. fre-
quency while maintaining a low output capacitance.
These characteristics minimize the adverse loading
effects from the disabled outputs. Larger arrays are
constructed by extending this connection technique to
more devices.
Driving a Capac itive Load
Figure 6 shows an implementation requiring many out-
puts to be wired together. This creates a situation
where each output buffer sees not only the normal load
impedance, but also the disabled impedance of all the
other outputs. This impedance has a resistive and a
capacitive component. The resistive components
reduce the total effective load for the driving output.
Total capacitance is the sum of the capacitance of all
the disabled outputs and is a function of the size of the
matrix. Also, as the size of the matrix increases, the
length of the PC board traces increases, adding more
capacitance. The output buffers have been designed to
drive more than 30pF of capacitance while still main-
taining a good AC response. Depending on the size of
the array, the capacitance seen by the output can
exceed this amount. There are several ways to improve
the situation. The first is to use more building-block
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| MAX4358ECE | 32 x 16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers |
| MAX4358 | 32 x 16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4356ECD | 功能描述:模擬和數(shù)字交叉點 IC RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產品:Digital Crosspoint 封裝:Tube |
| MAX4356ECD+ | 功能描述:視頻開關 IC 16x16 Nonblocking Video Crx Switch RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4356ECD+T | 功能描述:視頻開關 IC 16x16 Nonblocking Video Crx Switch RoHS:否 制造商:Texas Instruments 開關數(shù)量:4 開啟電阻（最大值）:12 Ohms 傳播延遲時間: 開啟時間（最大值）: 關閉時間（最大值）: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:WQFN-42 封裝:Reel |
| MAX4356ECD-T | 功能描述:模擬和數(shù)字交叉點 IC RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產品:Digital Crosspoint 封裝:Tube |
| MAX4357ECD | 功能描述:模擬和數(shù)字交叉點 IC Integrated Circuits (ICs) RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產品:Digital Crosspoint 封裝:Tube |
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